Sight-glass for routing-machines.



J. W. NELSON.

SIGHT GLASS FOR ROUTING-MACHINES.

APPLICATION FILED 001.12. 1914.

)Patented July 27, 1915.

JOHN W. NELSON, OIF NEW YORK, N. Y.

SIGHT-GLASS FOR ROUTING-MACHINES.

Specification of Letters Patent.

Patented duly 21'?, 1915.,

j Application led October 12, 1914. Serial No. 868,273.

To all 'whom it may] concern.'

Be it known that l, JOHN W. NELSON, a citizen of the United States, and a resident of New York city, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Sight- Glass for Routing-Machines, of which the following is a full, clear, and exact description.

ong the principal objects 'which the present invention has in view are: to provide a magnifying glass and an adjustable holding mechanism therefor, arranged to permit the operator to guide a relatively small'cutting tool with greater accuracy; to providel means to prevent the flying of danv gerous particles cut from the work being executed; and to provide means for augmenting the area of operation of the magnifying member.

DrawingaFigure 1 is a perspective view, showing the cutting head of a routing machine, having applied theretoI a sight glass constructed and arranged in accordance with the present invention; Fig. 2 is a 'detail view of a sight glass and support therefor, constructed and arranged in accordance with the present invention, the same being shown as attached to routing machine; and Fig. 3 is'a section taken on the line 3-3 in Fig.. 2.

Description-As shown in the drawings, the lass' 8 is mounted in a frame 9, from whic extends a post 10. The post 10 has a threaded extension 11 to receive a wing nut 12 and a washer 13. rlhe extension 11 passes through an elongated slot 14 in a vertical plate 15. The slot 14 and plate 15 are provided to permit the adjustment of the post 10 and the glass 8 mounted thereon to be adjusted vertically with reference to the work 16 on the bed plate 17.

'lhe plate 15 is pivotally secured at the outer end of an articulated plate 18 by means of the screw post 19. The post 19 is provided with screw threads, as shown in F ig. 3 of the drawings, to receive a wing nut 20. The wing nut operating through a washer 21, is employed to bind the plate 15 non-rotatively to the plate 18. The plates 18 and 22 constitute an adjustable articulated structure, whereby the horizontal arrangement of the glass 8 may be varied to adjust the focal axis of the glass with the work under observation. rlhe plates are pivotally connected by screw bolts 23 and 24.

The bolts 23 and 24 are provided with wing j a routing machine. The loop is contracted on the said arm by a screw bolt 32, which extends through suitable erforations in the end of the loop 30 and t e plate 29 and is externally provided with a nut 33.

A light shield 34 is adjustably mounted O n a stud bolt 35 and held in working posit1on by a nut 36. When in service, the oce o the shield 31 is to catch or stop any partlcles out from the work 16. Grave inconvenience has heretofore been experienced in the work from the li ing particles cut from the work by the routmg tool.

When a routing machine is provided with a slght glass and mounting therefor, constructed and arranged as above described and as shown in the accompanyin drawings, the operation is as follows z-T e work 16 and bed plate 17 thereof having Lbeen clamped to the table 37, the nuts 20, 25 and 26 are preliminarily loosened to permit the plates 18 and 22 to swing freely in a horizontal plane. The nut 12 in the plate 15 is then loosened and the glass 8 is placed in focus with the cutting point of the routing tool. The'various nuts l2, 20, 25 and 26 are then tightened, holding the plates 15, 18 and 22 rigidly positioned on the bracket plate 28. rllhe adjustment between the glass 8 and the cutting point of the tool thereafter remains fixed.

The shield 34 is arranged to cover the upper edge of the sight glass 8 and toextend beyond the same in such manner as to obstruct the Hight of particles cut or chipped from the work 16.

Claims:

1. n apparatus as characterized comprising, a magnifying glass; a holding :trame therefor embodying a laterally extended screw-threaded post; a longitudi nally-slotted vertically disposed plate to support said glass, frame and post connected therewith; a clamp nut mounted on said post to hold the same in fixed relation to said plate; a bracket plate adapted to be ixedly mounted on a routing machine to move therewith; a plurality of articulated plates operatively connecting said slotted locking the said plates in xed relation; and

a shield ixedly mounted on said bracket plate to cover an area external to said glass and frame therefor.

3. An apparatus as characterized comprising, a magnifying glass; a holding frame therefor embodying a laterally extended Maase? screw -threaded post; a longitudinallyslotted vertically disposed plate to support said glass, frame and post connected therewith; a clamp nut mounted on said post to hold the same in xedrelation to said plate;

a bracket plate adapted to be iixedly mounted on a routing machine to move therewith; a plurality of articulated plates operatively connecting said slotted plate and said bracket plate; means for locking the said plates in ixtd relation; and means for reversing the operative position of said slotted plate for altering the adjusted area of said glass.

In testlmony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

` JOHN W. NELSON.

Witnesses:

FREDERIC E. MORITZ, HENRY H. MORITZ. 

